Steam-boiler furnace



May22,1923 1,456,119

y lJ. J. BRIDGEFORD STEAM .BOILER FURNACE Filed June 1 1921 v 2' sheetssheet 1 May 22', 1923. f 1,456H9 J. J. BRlDGx-:FQRU l STEAM BOILER FURNCE Filed June l, 1921 2 Sheets-Sheet ,2

't Pl 'in eine ai fr i l; l, @j if lli ily o JOHN J. BRIDGEFORD, 0F PHILAIDELPHA, PENNSYLVMIA.

STEIJLBULER FUENACE.

Application filed June 1,

To all whom t may concern.

Be it known that l, JOHN J. llnrncnronn, a citizen ol the United States, residing` at Philadelphia, in the county ot hiladelphia and State ot Pennsylvania.ya have invented certain new and useful Improvements in Steam-Boiler Furnaces, of which the Ylol.- lowing;` is a speciiication.

My invention relates to steam-boiler l'urnaces and particularly to means Yfor obtaining,` a more perfect combustion of the fuel with a consequent elimination of smoke and unspent `gaseous products of combustion.

Prior constructions have been devised t supplying air to the lire above the vgratebars in order to furnish oxygen in suiticient quantities tor perfect combustion. ln such prior constructions tlues have been provided in the side walls consisting oi" tiles placed end-to-end7 such l'lues communicating' with intake dues in the bridge wall whereby to heat the air delivered above the lire.

rlhe purpose ot the present invention is to generally improve such prior constructions, one object of the invention being` to provide a novel type oli' flue i-or the side walls.

Another object of the invention is to provide means by which an attendant may regulate at will the supply of air.

A further object ot the invention is to so construct the bridge-wall that it will act as baffle wall and not only cause an even distribution of the heat around the crown sheet of the boiler but also a strong.` suction or draft to thoroughly nain the air drawn over the fire through the tlues in the side walls vith the frases oit combustion whereby to secure a complete burning ot such before passing' over the bridge-wall.

A still further object of the invention is to provide a construction for the carryingr out of the -above objects which can be applied to boilers already set as well as to new boilers in the setting.

The-se and such other objects as may hereinafter appear are attained by the novel construction, combination and arrangement ot parts to be hereinafter specifically described and claimed.

Reference will now be had to the accompanying` drawings forming; a part ot this specification, wherein:

Figure l is a horizontal sectional view ot my improved furnace construction taken i921. kserian no. 474,116.

just below the boiler and looking downwardly.

Figure 2 is a vertical sectional view of the furnace construction showingl the boiler in elevation.

Figure is a vertical sectional view taken on the line 3-3 of Figure l looking;` in the direction ot the arrows.

Figures Ll, 5 and 6 are detail views of a lire briclr block for the formation ot the tlues.

Throughout the following detailed description and on the several figures ot the drawing, similar parts are referred to by iilre reference characters.

Referringto the drawings, A. designates a steam boiler and l and 2 the side walls and 3 the bridge-wall oli the furnace. The. I`grate-bars are designated by the reterence numeral and 5 designates the ash-pit.

The llues 6 are arranged in the side walls above the grate-bars and are formed of lire brick bloc rs 7 placed end-to-end and constructed to interlock. Each bloclr is 12 inches long, 871A inches thick, and 5 inches high. llxtending` longitudinally through the center ot each block is a 2 inch hole and communicating' therewith are 'four transverse inch holes extending to one edge tace ot the block. The two end 1; inch holes are inches lrom the respective ends ot the. bloclr while 3 inches separates the intermediate holes from each other and from the end holes so that when a series ot blocks are arranged end-to-end a vflue will be formed having a 2 inch passage extending longitudinally thereo'i from endtoeend and hinting` transverse i.; inch holes spaced uniformly 3 inches apart and extending from one edn'e tace of the tine to and coniniunicating` with the central longitudinal 2 inch passage. Each block is formed at one end with a slight protuberance 8 surroundine; thc longitudinal 2 inch hole while at the other end ot the blocl-r a correspondingrecess 9 is formed. `When the blocks are placed end-t-o-end the protuberance 8 ot one block will interlock in a recess 9 oi the next block and form a tight joint so that the air drawn into the Hue through the longitudinal 2 inch passage can onlyT escape through the transvers inch holes. The blocks 7 are of such size to talre the exact space ot two courses of ordinary brick both in width and height which greatly facilitates the installation ot the flue in the side walls during` con- Viron front between the ash-pit doors.

burning systems.

the transverseginch'holes do notvv appreciably weaken the construction of thehside wallsk for either the lire brick lining or the vred brick filling as' it has a. inch bearing surface each side of the 2 inch passage.

HThe fines 6 communicate atvone end with vertical iues l() formed in the side walls. Extendingy through the ybridge-wall -just beneath the. grate-bars and centrally of the side walls and projecting slightlyat `one end .into the ash-pit yis a y@winch pipe 11. Thepipe ,11i projects at its other endlslightly to the rear of thebridge-wall andhas con.- nected thereto a 6 inch T 12. A pair vof 6 inch pipes 13 extending transversely of the furnace and parallel to the rearface of the bridge-wall andv are joined at one endto the 12. and. at tlieother end to 6 inchelbows 14 set into the siderwalls andcomm-unicating withthe vertical fines 10..

The rend of the pipe 11 which projects into the ash-pit has hinged. thereto a damper ,15.which is controlled by means of a rod .16 having one end connected to the damper and which` passesthrough the cast The rod 16 is provided-at its outer end with a rack 17 for cooperation: with an edge of they cast iron yfront to .hold'the damperhin adjusted positions. rllhe damper and damper rod are so4 constructed and arranged as not tointerfere rwith the `manipulation ,of the grate-bars lnor the cleaning` of the ash-pit.

By means of the damper 15 theamount of oXygencan be regulated .for the burning of either softror hard coal and also for oil A-S) incl .fire brick wall 18 extends upwardly v from =the floor of the combustion chamber and hasa top wall 19 `joining the bridgeavall to lform a compartment. 2Ol to encase andv form a` super-heating chamber for the intake pipes 13; The air taken into the pipe 11 from'the ash-pit is thussuperheated in' the Acompartment 2O as ittpasses through the pipes 13 before being delivered to the flues 6 to be drawn through the transverse holes therein over Athe fire.A The pro vvision of the wall 18 4also allows for the cleaning'of the combustionchamber without anyobstruction'.`

On top of the b 1idge-wall is built a 9 inch lire brick wall 21'forming anextension of theI biidgewvall..v The upper edge of the bridge-wallextension 21has a curved formation similar to that of the crown sheet of thel boiler and extends to within 7 inches of the crown sheet in order to provide for an even distribution of the heat around the crown sheet." The' Wall 21 also forms abafe compelling the hot gases of combustion to rise and pass. through v*the narrow space be` tween the edge ofthe walllvandthevcrown sheet in order to pass to the combustion chamber, thus creating a strong suction or draft in 'the chamber" above the grate to c lrawwinlthe air from the flues 6 to commingle with the gases of combustion to` cause a. complete `burning of the same with a consequent elimination of smoke and unspent gases and preventing the formation of-clinkers y 1 f Having thus described myV invention, what l claim as new and desire to secure by Letters Patent of the United States is:

lxln a furnace having `side walls; a bridge wall and grate 'in front ofthe'bridge wall, said bridge wall inoluding'a forward extension inclining upwardly from the level of the grate andf'forming a defiecting surface for directing the gases ofcombustion toward the boiler, a wall on` top of said bridge wall extending upwardly intoclose proximity to the crownisheetof` the boiler and providing a narrow uni-form passage therebeneath toward-fwhich Jthe deflecting surface aforesaid directs vproducts `of c0m bustion, a wall risingv from the'ffloor of .the combustion chamber in the `rear of and spaced away from the bridge Wall connect ing. at' its top 'with the latter to form` a super-heating chaniber fan air Yconduit extending from the ash pit through the bridge Wall into the super-heating chamber and having lateral branches therein, and a flue extendinglongitudinally of eaehside wall above the grate and communicating at reg ularly. spaced intervalsy with the r` space abovethe same, said flue joining the lateral.

branches aforesaid.

2. ln 'a furnace having bridge wall and gratein front of the bridge wall, said bridge wall* including a forwardl A extension inclinmg upwardly from the level y of the grate and storming. a deflecting surface forv directing the gasesv of combustion toward the boiler, a wall on top ofjsaid bridge wall extending upwardly into close proximity to the crown sheet of the boiler and providing 'a narrow unlfornrpassage therebeneath toward which' the defleeting surface aforesaid directs productsy of -coin-V bustion7 a wall rising vfrom thejfloor of the combustion chamberin the` rear 'of and spaced away from the bridge'wallco-nnecting at its top with the latter to form a superheating chamber an 'air conduit VeX- tending from the ash pit through the bridge wall into the*`supersheatingl chamber and having lateral branches therein,' a flueeX- tending longitudinally of each-side `wall abovethe grateand composed of aseri'es of fire brick blocks set intoy the lwall,y ,said blocks having a relatively large longitudinal passagel extending :from end to` 'end of side walls, a

the series centrally of the blocks With a air tight joint, and damper means arranged series of uniformly spaced relatively fine at the inlet of the intake conduit having openings extending transversely of the manipulating means therefor extending to 10 series, said blocks each having at one end the front of the furnace.

an annular recess and at the other end an In testimony whereof I my signaannular projection surrounding the longiture.

tudinal passage and forming a substantially JOHN J. BRIDGEFORD. 

